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Diadem

A diadem is a type of crown, specifically an ornamental headband worn by Eastern monarchs and others as a badge of royalty. The word derives from the Greek διάδημα diádēma, "band" or "fillet", from διαδέω diadéō, "I bind round", or "I fasten".
The term originally referred to the embroidered white silk ribbon, ending in a knot and two fringed strips often draped over the shoulders, that surrounded the head of the king to denote his authority. Such ribbons were also used to crown victorious athletes in important sports games in antiquity. It was later applied to a metal crown, generally in a circular or "fillet" shape. For example, the crown worn by the kings of Anglo-Saxon England was a diadem, as was that of a baron later. The ancient Celts were believed to have used a thin, semioval gold plate called a mind as a diadem. Some of the earliest examples of these types of crowns can be found in ancient Egypt, from the simple fabric type to the more elaborate metallic type.
A diadem is also a jewelled ornament in the shape of a half crown, worn by women and placed over the forehead. In some societies, it may be a wreath worn around the head. The ancient Persians wore a high and erect royal tiara encircled with a diadem.